您可以使用 phonegap 中的 FileReader 对象检查文件是否存在.您可以检查以下内容:

You could check if the file exists using the FileReader object from phonegap. You could check the following:

var reader = new FileReader();
var fileSource = <here is your file path>

reader.onloadend = function(evt) {

    if(evt.target.result == null) {
       // If you receive a null value the file doesn't exists
    } else {
        // Otherwise the file exists
    }         
};

// We are going to check if the file exists
reader.readAsDataURL(fileSource);